Considering only the highlighted hydrogens,list the following compounds in order of decreasing acidity:

Question

Quizplus · Accepted Answer

The acidity of the highlighted hydrogens is determined by the stability of the corresponding conjugate base. Compounds III and V have strong electron withdrawing groups (EWG) on the adjacent carbon atoms, making the conjugate bases more stable, and thus less acidic. Among the remaining three compounds, the conjugate base of compound IV is most stable due to the resonance stabilization provided by the adjacent carbonyl group. Therefore, compound IV is the most acidic, followed by compound I which has only one EWG on the adjacent carbon atom. Compound II has two EWGs on the adjacent carbon atoms, but no resonance stabilization, making it the least acidic among the remaining compounds. Therefore, the correct order of decreasing acidity is IV>I>III>II>V, which is given by choice C.

Considering Only the Highlighted Hydrogens,list the Following Compounds in Order